| 摘要 |
A fault detection system (10) for monitoring at least one operating parameter of an AC power transmission line (12) includes current and/or voltage transducers (14) connected to the transmission line for providing an analog signal (16) representative of at least one time varying parameter of the AC power transmission. An analogto-digital (A/D) converter (18) converts the analog signal to digital sample words (22). A high sped DSP module (30) operates on the digital words and generates a trigger signal (33) when a disturbance is detected. A DMA component (32) implements a memory allocation protocol to sequentially address a plurality of memory zones (41) in a loop for sequential storage of the digital sample words in discrete storage locations of the addressed memory zone. According to a fault condition memory allocation protocol, the DMA component (32) removes at least one of the plurality of memory zones from the loop addressable by the DMA when the removed memory zone includes user-determined amounts of pre-fault, fault and post-fault digital sample words defining the AC abnormality.
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